Standing on a crate inside Walt Disney Studios Stage 1 is Rocket from Guardians of the Galaxy . He's talking with a crowd of people wearing the same ordinary-looking sunglasses that I am. He's larger than life, speaking with full-body movements and natural gestures.

Then I take off the glasses , and I can see that Rocket was on a screen, not an animatronic figure standing on the physical crate. When Rocket stops moving, out from behind a curtain -- Wizard of Oz-style -- steps an actor who's been doing all the movements and voice work on Rocket's behalf.

I could wear these glasses all day and never know there's anything out of the ordinary about them. They're regular sunglasses when you're outdoors, before transforming into XR glasses when you look at a special screen.

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